Showing results for 
Search instead for 
Did you mean: 
Ali Razavi

T1 Multilink and Fair Queueing

Hi everyone,

When configuring a T1 x 2 multilink interface, do we enable fair queueing on the individual serial interfaces or on the single Multilink1 interface associated with that group? 

I recently had to deploy a WAN link where I enabled fair queueing on the serial interfaces and after a short time, the interfaces simply stopped passing traffic until I disabled the fair queueing and physically reseated the cables. 

I have another link where one serial T1 interface has fair queueing enabled and the other does not, yet they are both defaulting to FIFO with the one configured for WFQ stating (WFQ suspended, using FIFO). 

Thanks in advance

Joseph W. Doherty
Hall of Fame Expert


The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.


This interface fair-queue?  If so, for me, it's been so long since I used that especially with MLPPP; I don't recall.  However, if your devices support CBWFQ, try that on the MLPPP logical interface configured with FQ.